<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>H_Media媒体查询</title>
    <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0, viewport-fit=cover，user-scalable=no" name="viewport" />
    <style>
        @media screen and (max-width:400px){
            html,body{
                background:red;
            }
        }
    </style>
</head>
<body>



</body>
</html>